Answer:
Solution is 4.67% by mass of salt
Explanation:
% by mass is the concentration that defines the mass of solute in 100g of solution.
In this case we have to find out the mass of solution with the data given:
Mass of solution = Mass of solute + Mass of solvent
Solute: Salt → 14.2 g
Solvent: Water → 290 g
Solution's mass = 14.2 g + 290g = 304.2 g
% by mass = (mass of solute / mass of solution) . 100
(14.2 g / 304.2g) . 100 = 4.67 %
Answer:
Explanation:
1.). A pure substance has a/an ___definite____ composition.
Pure substances have a definite composition and all their parts are same throughout.
2.). A/An ___mixture____ is composed of two or more types of matter that can be present in varying amounts.
Mixture is a blend of two or more types of matter.
3.). A solution is a/an ___homogeneous ____ mixture.
Solutions are homogeneous mixtures of solutes and solvents.
4.). A mixture that is not uniform throughout is a/an ___heterogeneous ____ mixture.
A mixture that is not uniform throughout is said to be heterogeneous.
5.). A pure substance that cannot be broken down chemically is a/an _______.
An element : is a distinct substance that cannot be split-up into simpler substances.
6.). A characteristic of matter that’s not associated with a change in its chemical composition is known as a/an __physical_____ property.
Physical property tells us everything about what a substance is when no change is occuring to its constituents.
7.).Wax melting is an example of a/an ___physical change____ change in the state of matter.
Physical change is one that alters the physical properties of matter.
8.). A banana peel turning brown is an example of a/an ___chemical____ change in the state of matter.
Chemical change is one in which a new matter is formed.
Answer:
7.5 mol of hydrogen would be needed to consume the available nitrogen.
Explanation:
- The balanced equation of the reaction of hydrogen with nitrogen is:
<em>3H₂ + N₂ → 2NH₃</em>
it is clear that 3mol of hydrogen react with 1 mol of Nitrogen to give 2 mol of ammonia.
- firstly, we need to calculate the number of moles of both
for H₂:
number of moles = mass / molar mass = (7.00 g) / (2.00 g/mol) = 3.5 mol.
for N₂:
number of moles = mass / molar mass = (70.00 g) / (28.00 g/mol) = 2.5 mol.
<u>using cross multiplication</u>
1 mol of N₂ needs → 3 mol of H₂
2.5 mol of N₂ needs → ??? mol of H₂
∴ the number of mol of H₂ needed = (3*2.5) / 1 = 7.5 mol
So, the right choice is:
7.5 mol of hydrogen would be needed to consume the available nitrogen.
244.4 degrees farenheit. (118 degrees celsius)
Answer:
the sun and moon are aligned with the earth.